Paul McCartney, Ringo Starr performing at Grammy Awards

Most people won't turn on the 56th annual Grammy Awards to see whether Imagine Dragon's "Radioactive" will win for best rock performance. They won't be glued to their sets to find out if Anthrax can top Killswitch Engage for the title of best metal performance.

Instead, they will tune in to see the all-star collaborations — which long ago surpassed the handing out of the actual awards as the best reason to watch the Grammys. Here's a look at the some of the more promising performances scheduled for the 2014 Grammys.

Note that both Paul McCartney and Ringo Starr have been confirmed as performers, but there is no official word that they will play together.